93 lines
2.4 KiB
JavaScript
93 lines
2.4 KiB
JavaScript
/**
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* Performs a standard value-by-value diff between buckets
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*
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* Copyright (C) 2017 R-T Specialty, LLC.
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*
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* This file is part of the Liza Data Collection Framework
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*
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* liza is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* This can be called a "dumb diff".
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*/
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var Class = require( 'easejs' ).Class,
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ArrayDiff = require( '../../util/ArrayDiff' ),
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BucketDiff = require( './BucketDiff' ),
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Context = require( './BucketDiffContext' );
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module.exports = Class( 'StdBucketDiff' )
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.implement( BucketDiff )
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.extend(
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{
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/**
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* Constructor for diff result
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*/
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'private _Result': null,
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/**
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* Responsible for a shallow diff of array values
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* @type {ArrayDiff}
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*/
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'private _arrdiff': null,
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__construct: function( arrdiff, Result )
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{
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if ( !( Class.isA( ArrayDiff, arrdiff ) ) )
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{
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throw TypeError( "Expecting ArrayDiff; received " + arrdiff );
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}
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this._arrdiff = arrdiff;
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this._Result = Result;
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},
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/**
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* Perform a diff given a diff context
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*
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* @param {BucketDiffContext} context diff context
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*
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* @return {BucketDiffResult} result of diff
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*/
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'public diff': function( context )
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{
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if ( !( Class.isA( Context, context ) ) )
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{
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throw TypeError( "Expected BucketDiffContext" );
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}
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var changed = {};
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var arrdiff = this._arrdiff;
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context.forEachField( function( field, a, b )
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{
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var diff = arrdiff.diff( a, b ),
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i = ( a.length > b.length ) ? a.length : b.length,
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changes = [];
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while ( i-- )
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{
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changes[ i ] = ( diff[ i ] !== undefined );
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}
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changed[ field ] = changes;
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} );
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return this._Result( context, changed );
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}
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} );
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